Boiler



' (N0 Model.)

.E.HOOIK. STEAM BOILER,

Patented Feb. 22', 1898.

A TTOHNE rs.

THE NORRIS PETERS co. PHOYO LlTHD-, wnsnmsvou, n. c

lowing is a full, clear, and exact description.

. struction and combination of parts, as is herein which similarcharacters of reference indi- AT FICEQ ENOS HOOK, OF YORK, N.- Y.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 599,609, dated February22, 1898. Application filed May 14, 1897. Serial No. 636,473. (N model.)

To all whom itqmty concerm.

Be it known that I, ENos HOOK, of New York city, in the county and'Stateof New York, have invented new and useful Improvements in Steam-Boilers,of which the fol- Thisinvention relates to improvements in steam-boilersof a type having depending water-tubeshung from the crown-sheet of thewater-chamber, so as to receive heat from the fire-chamber andthehot-airpassage at the rear of said fire-chamber.

The'object of the invention is to provide features of improvement for asteam-boiler of the designated type whereby increased elliciencyisattained by the provision of greater heat-receiving area within theboiler than in boilers of the class above specified as heretoforeconstructed. 1 v

The invention consistsjin the novel coninafter described, and definedin'the appended claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification,

cate corresponding parts in all the figures.

Figure 1 is a sectional side; view of the boiler, showing part of theimprovement thereon. Fig. 2 is a sectional plan-view essentially on theline 2 2 in Fig. 3. Fig. 3 is a transverse sectional View substantiallyon the line 3 3 in Fig. 2. Fig. 4 is an enlarged vertical sectional viewof novel details substantially on the line 4 4 in Figs. 2 and 5, andFig. 5 is an enlarged sectional detail view on theline5 din-Fig. 4. V

The exterior shell of the boiler in this exemplification of the appliedimprovements is preferably made cylindrical, as shown at in thedrawings, and said shell is set in place on masonry A, but it is to beunderstood that the boiler-shell may, if desired, be otherwise supportedand protected at the sides.

An interior shell 11 is held in position within the outer shell 10 byits secured engagement with the boiler-head plates 12 and 13, that arerespectively affixed at the front and rear ends of the said shells. Thefront headplate 12 is apertured to afford access to the interior of thefire-chamber B, which is produced at the front end of the boiler by theIi ngarea in the boiler.

transverse bridge-wall O and. grate-bars D. The upper surface of theinterior shell 11 is flattened to provide a crown-sheet 11, and numerouswater -tubes 14. hang from the crown-sheet. The tubes 14 are open attheir upper ends and closed at the lower ends, which adapts each tube toreceive water from the space between the shells 10 and 11.

Over the grate-bars andinthe fire-chamber B the depending water-tubes 14are shortened, so asto permit space for fuel on the gratebars, the majorportion of the spaced watertubes occupying the hot-air chamber anddraft-passage B, that extends from the fiiechamber Bbehind thebridge-wall O.

The usual transversely-disposed crown-bars 15 areaffixed at'suitableintervals on the crown-sheet by bolts which project from said sheet,whereby the crown-sheet is substantially braced against disruptingpressure of steam generated in the boiler.

On the outer shell 10 a dry-steam dome or chamber 16 is preferablyplaced and is connected with said shell by the neck-pipes 17, asshown inFig. 1. The draft-passage B communicates at its rear endwith atransverse passage B connected at its bottom with a rearwardly-extendinghorizontal line B and this flue at its rear end communicates with avertical draft-chimney, (not shown,) so that the hot products ofcombustion evolved by burning fuel on the, grate-- bars D pass backbetween the depending water-tubes 14, and thence to a stack at the rearend of the boiler. The foregoing descriptionof parts briefly indicatesthe usual construction of boilers having depending water-tubesand is notbroadlyclaimed as being a feature ofthe present invention.

In boilers of the depending water-tube type as heretofore constructed avacant spaceisproduced at each side of the crownsheet if the inner shell11 is cylindrical. One feature of the present improvement is designed toutilize these spaces and provide longitudinally-extended Water-tubestherein,

which will greatly increase the Water-heat- To this end fourheader-boxes 18'are provided, two being 10- cated'at each side of thedepending watertubes 14 near the front and rear ends of the shell 11.The end walls of each header-box are parallel and have one side wallconvexly curved to adapt said side for intimate contact throughout itsarea with the inner side of the shell 11, and the boxes 18 are firmlysecured upon said shell by any suitable means.

The front and rear walls of the headerboxes 18 are provided withcircular apertures suitably spaced apart, and in the spaced orifices ineach pair of boxes a set of watertubes 19 are secured by their ends in awatertight manner. The apertures in the parallel walls of theheader-boxes that are spaced from those wherein the water-tubes arefixed have bonnets 20 secured over them by any suitable means,preferably as shown in Fig. at, where cross-bars and bolts arerepresented as means for clamping the bonnets over the hand-holes in theouter walls of the headerboxes.

The convex sides of the header-boxes 18 and adjacent portions of theshell 11,engaged therewith, are suitably apertured, as at a in Figs. 1and 5, which permits water from the water-space in the boiler to enterthe headerboxes and circulate through the water-tubes 19. The coveredhand-holes that are opposite the water-tubes at each end enable them tobe cleaned by the insertion of ascraper or brush.

The annular water-space formed between the inner shell 11 and outershell 10 of the improved steam-boiler may be measurably widened towardthe upper surface of the inner shell 11 by disposing the shell 10 asshown in Fig. 3.

In the annular water-space extending from one side edge of thecrown-sheet to the opposite side edge thereof a number of rows of spacedheat-conveying fiues 21 are held by their ends in the front and rearhead-plates of the boiler, these spaced fines being arranged to occupysuch relative positions in the water-space as will permit a freecirculation of water around them, as shown in Figs. 2 and 3, room beingafforded for the location of a hand-hole b and bonnet covering the sameat each end of the boiler, as shown in Figs. 1 and 3.

The construction and arrangement of the longitudinally-extendingwater-tubes 19 and longitudinal lines 21 economically utilize the vacantspaces in a boiler of the dependingwater-tube class. The operation,briefly described, is as follows: The products of combustion evolved inthe fire-chamber 13 pass rearwardly between the water-tubes 14.- in thepassage B and at the rear enter the transverse passage B Thence the heatand gases pass forwardly through the longitudinal flues 21, thence backbeneath the shell 10 to a passage leading out to a chimney. (Not shown.)

It will be evident that the products of fuel consumed will be broughtintimately into contact with the exterior of the water-tubes 19, as wellas the interior of the fines 21, and impart a larger proportion of heatto the water in the boiler for the generation of steam than is effectedin boilers not having the improvements.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. In a steam-boiler, the combination with an outerand an inner shell, end walls for the boiler, and water-tubes dependingfrom the top wall of the inner shell to receive heat from a fire-chamberin the inner shell, of water-tubes secured by their ends withinheaderboxes, aflixed to the inner shell of the boiler and in opencommunication with the waterspace of said boiler,substantially asdescribed.

2. In a steam-boiler, the combination with an outer and an inner shell,walls engaging the ends of said shells to produce an annular water-spacefor the boiler, and water-tubes depending from a fiat crown-sheet on theinner shell so as to be enveloped by heat produced in afire-chamberwithin the inner shell, of sets of longitudinally-disposed water-tubesat opposite sides of the inner shell, between the depending water-tubesand said inner shell, and a header-box for each end of each set oftubes, which boxes are secured on the inner shell and are in opencommunication with the annular water-space of the boiler, substantiallyas described.

3. In a steam-boiler, the combination with an outer and an inner shell,end Walls for the boiler, spacing the inner shell from the outer shell,a crown-sheet on the inner shell, crownbars therefor, and watertubesdepending from said crown-sheet between the crownbars, of hollowheader-boxes secured on the inner wall of the inner shell, between saidshell and the depending water-tubes at each side of the boiler, andhorizontal water-tubes having their ends affixed in one of the walls ofthe header-boxes and spaced apart therein, the opposite walls of saidheader-boxes being apertured and said apertures being closed,

1 the sides of the boxes attached to the boilershell being in opencommunication with the Water-space of the boiler, substantially asdescribed.

4. In a steam-boiler, the combination with an outer and an inner shell,end walls for the boiler, spacing the inner shell from the outer shell,and depending water-tubes closed at their lower ends and hung from theupper side of the inner shell, of series of horizontally-disposedwater-tubes at each side of the depending tubes, said water-tubes havingtheir ends in open communication with header-boxes communicating withthe water-space of the boiler, and series of heat-conducting fiueslocated in the water-space of the boiler and affixed at their ends inthe end walls of the boiler, substantially as described.

ENOS I-IOOK. lVitnesses:

WM. P. PATTON, JNo. M. BITTER.

